We use your PayPal email address to match your PayPal deposit to your user account. If the email address does not match your contact address, we have to assume that the deposit came from someone else. Since our Terms and Conditions of Service do not allow our service to be used to transfer money from one person to another, we have to regard such deposits as nonrefundable.
If you receive this message because you used an alternate email address, but you are the one who made the deposit from your own PayPal account, you may safely disregard it. This only ever becomes an issue if you request a refund. If your account was funded by a "nonrefundable" PayPal deposit, we'll review it. We're typically able to return a balance remaining from a PayPal deposit to the address it came from.